| 1. | Corrected the description of entity integrity 更正了实体完整性的说明。 |
| 2. | Entity integrity defines a row as a unique entity for a particular table 实体完整性将行定义为特定表的唯一实体。 |
| 3. | Is a constraint that enforces entity integrity for a specified column through a unique index 一个约束,该约束通过唯一索引来强制指定列的实体完整性。 |
| 4. | Is a constraint that provides entity integrity for a specified column or columns by using a unique index 通过唯一索引为指定的一列或多列提供实体完整性的约束。 |
| 5. | Is a constraint that enforces entity integrity for a specified column or columns by using a unique index 通过唯一索引对指定的一列或多列强制实体完整性的约束。 |
| 6. | This column , or columns , is called the primary key of the table and enforces the entity integrity of the table 这样的一列或多列称为表的主键( pk ) ,用于强制表的实体完整性。 |
| 7. | Unique is a constraint that provides entity integrity for a specified column or columns through a unique index 一个约束,该约束通过唯一索引为一个或多个指定列提供实体完整性。 |
| 8. | Entity integrity enforces the integrity of the identifier columns or the primary key of a table , through unique indexes , unique constraints or primary key constraints 实体完整性通过unique索引、 unique约束或primary key约束,强制表的标识符列或主键的完整性。 |
| 9. | Entity integrity constraints , referential integrity constraints , and user - defined most intergrity constraints of relational database were all preserved after the conversion 转换过程可保留关系数据库的实体完整性约束、参照完整性约束和绝大部分的用户自定义完整性约束。 |
| 10. | Might indicate a system - level problem cannot make a connection to the database , a logical problem no more rows in the result set , or a problem with the specific data the primary key for the row you just tried to insert already exists or violates an entity integrity constraint 可能指示一个系统级问题(不能连接到数据库) 、逻辑问题(在结果集中没有更多的行)或者特定数据的问题(您刚才试图插入行的主键已经存在或者违反实体完整性约束) 。 |